I've read comments on a German gaming mag saying that Stronghold 3 has several technical problems - but a patch is already announced to come "soon".
One commentator went to the exetreme and even called Stronghold 3 a "beta version".

(Interesting word : "theexetreme" …)

— “ Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius – and a lot of courage – to move in the opposite direction.“ (E.F.Schumacher, Economist, Source)